Separable attachment plug



Nov. 8, 1927. 1,648,351

A. H, KLINE SEPARABLE ATTACHMENT PLUG Filed April 25, 1925 INVENTOR AJZZKL lNE BY w ,4.

ATTORNEYS Patented Nov. 8, i927 ARTHUR HENRY KLINE, OF CHICAGO, ILLINOISv SEPARABLE ATTACHMENT PLUG.

Application filed April 25. 1525. Serial fie. 25,935.

My invention relates to improvements separable attachment plugs and it consists in the combinations, constructions and ar rangements herein described and claimed.

An object of my invention is to provide a separable attachment plug in which the bayonet cap is locked to the plug to prevent the accidental removal of the cap from the plug until the operator so desires, and in which the plug proper is provided with novel means for permitting the plug to be inserted into the electric light socket without the necessity of screwing the plug into place, this means removably holding the plug in the socket after the plug has once been inserted therein,

A further object of my invention is to provide a separable attachment plug in which the plug proper consists of two members removably secured to each other, one of these members carrying the terminals of the ping, while the other member acts as a cover ior the plug. In this way the terminals may be readily attached to the plug, and after so doing the other partof the plug may be secured in place.

A further object of my invention is to provide separable attachment plug which has been especially designed to be manu- 36 factored by the machinery now employed in making standard separable attachment plugs.

Other objects and advantages will appear in the following specification and the novel features of the invention will be particularly pointed out in the appended claim.

My invention is illustrated in the accompanying drawings forming a part of this application, in which Figure 1 is a side elevation of the device,

Figure 2 is a section along the line 2-2 of Figure 1,

Figure 3 is a section along the line 3-3 of Figure 2,

Figure 4 is a section along the line 44 of Figure 1, and

Figure 5 is a sectional view of a modified form of the device.

In carrying out my invention I provide a separable attachment plug consisting mainly of three parts. The part A carries the terminals, hereinafter described, the part B acts as a cover for the terminals, when the part B is secured to the part A, and the part C is the bayonet cap that is removably secured to the plug, consisting of the parts A and B.

The parts A and B when once secured to each other remain so and are only removed when it is necessary to fix either of the terminals carried by the part A. In Figure l I show the parts A and B as being secured to each other by a screw 1. The parts A and B are made of insulating material, such as bakelite or the like. The part A has a bore 2 therein for receiving the screw 1 while the part B has a threaded bore 3 therein for receiving the threaded portion of the screw 1. The bore 2 is enlarged as at 4 so as to receive the head of the screw, whereby the screw is entirely hidden from view.

The construction of the part A is shown in Figures 2 and 3, and it will be noted from Figure 2 that two terminals 5 and 6 are secured to the part A by rivets 7 and 8. The surface 9 of the part A has grooves 10 and 11 shaped so as to receive the terminals 5 I and 6. In Figure 3 I show the top of the terminal 5 as being bent into the shape of a U so as to have the upper end 12 of the terminal project above the top of the plug. The terminal is made of spring metal, whereby the end 12 is adapted to yieldingly engage with the terminal in the light socket.

In this way a good electrical contact is provlded.

It will be noted from Figure 3 that the U-shaped portion 12 extends around a lug 13 that projects from the body portion A. This lug performs a double function in that it acts as a stop for the end 12 and at the same time is adapted to be received in a recess 14 in the body portion B so as to prevent the movement of the parts A and B with respect to each other when these parts are secured to each other by means of the screw 1. Figure 4 clearly shows the recess 14 as being provided in the surface 15 of the body portion B.

The means for removably holding the plug in the socket comprises a conducting pin 16 that IS riveted to the terminal 6 at 17 and is provided with a head 18 that projects beyond the surface 19 as shown in Figure 3. The head 18 is partially received within a recess 20 and this recess is large enough to permit the head 18 to move inwardly so as to dispose the top of the head flush with the surface 19. The spring 6 is made of spring qualities and therefore tends to return the head 18 to the position shown in Figure 3. The spring quality of the terminal 6 is also strong enough to prevent the release of the head 18 when the head is received in the threads of the light socket (not shown) until the operator so desires. In other words, the plug will remain in place and will withstand normal tuggings upon it, as when the cord is attached to a vacuum cleaner or the like, but at the same time will permit the operator to remove the plug from the socket when it is so desired, this movement being accomplished by merely pulling the plug from the socket.

I will now describe the novel means for locking the bayonet cap to the plug proper,

- whereby the cap is locked in place and cannot be accidentally removed from the plug. The means for locking the cap in' place consists in a bolt 21 that has an enlarged portion 22 adapted to be received in a recess 23 in either one of the terminals 24 of the cap C. A bore 25 is provided in the bod ortion B for receiving the bolt 21 and this ore is enlarged at 26 to receive the enlarged portion 22. The body portion A has a recess 27 therein in which a coil spring 28 is disposed. The s ring bears against the ortion 22 of the olt and tends to hold the olt in the position shown in Figure 1. When the bolt is in this position a portion thereof projects beyond the outer surface of the plug. The bolt may be manually moved so as to compress the spring 28 and this movement will carry the portion 22 of the bolt out of the recess 23, whereby the terminals 24 are released and may be removed from the plug. The terminals 2 1 are connected to the cap C in the ordinary manner, and only differ from the standard terminals in that they are provided with the recesses 23 for receiving the locking bolt 21.

From the foregoing descri tion of the various parts of the device t e operation thereof may be readily understood. The terminals 5 and 6 are curved slightly so as to ieldingly engage with the terminals 24 and thus assure a good contact between the terminals. In Figure 3 I show the bottom of the grooves 10 and 11 as being provided with recesses 29 that receive the ends of the terminals 5 and 6. These recesses permit the flexing of the terminals when the cap is secured to the plug. 4

When the operator wishes to attach the cap C to the plug he first moves the bolt 21 inwardly and then inserts the terminals 24 into the openings provided by the recesses 10 and 11 in the body portion A and the recesses 30 and 31, provided in the body portion B. The portion 22 of the bolt is disposed out of the plane of the terminals 24 and therefore permits the terminals to be moved into place. As soon as the cap C has been moved into place the bolt 21 is released and the spring 28 will instantly .move the bolt so as to dispose the enlarged portion 22 in the recess 23. The bolt will now pi'event the removal of the cap C from the p ug.

The plug may now be inserted in the light socket and, as heretofore stated, the operator in doing so merely has to move the plug into the socket. When the plug is in place in the socket the head 18 will be received in the threads of the light socket and will prevent the removal of the plug from the socket until the operator so desires. The portion of the plug projected beyond the socket carries the locking bolt 21 and it therefore will be apparent that the cap C may be removed from the plug while the plug is still in the socket. The plug has been especially designed so as to dispose all of the metal parts on the body portion A instead of disposing part of these members on both body portions A and B. This construction cuts down the amount of operations necessary in manufacturing the plug, since in assembling the plug only one of the parts, i. e., the part A need be passed from operator to operator while the terminals are being secured in lace. After the terminals have been secure in place thebody portion B, which in reality is a cover, may be secured to the body portion A by means of the screw 1. The entire device is now assembled and is ready to receive the cap C.

In Figure 5 I show a slightly modified form of the device. This form is identical with the form heretofore described except for the fact that the head 50 is rovided with two ridges 51 whereby the ead engages with two threads in the light socket instead of with one, as is the case with the preferred form of the device. In other respects the modified form of the device is exactly the same and therefore needs no further description.

I claim:

In a device of the type described, a plug consisting of separable parts, means for securing said parts together, a resilient movable terminal and a fixed terminal carried by one of said parts, and a pin movably disposed in one of said parts and havin its inner end secured to said resilient terminal, said resilient terminal being adapted to yieldingly hold said pin in engagement with the threads of an electric light socket.

ARTHUR HENRY KLINE. 

